| Answer | Crossword Clue |
|---|---|
| SHALE | Rock often containing quartz |
| AGATE | Rock composed of quartz |
| SHALY | Containing fissile rock. |
| GRANITITE | Rock containing biotite. |
| PERIDOTITE | Rock containing olivine |
| GEODE | Rock containing crystals |
| GEODE | Rock containing crystal |
| CHERTY | Containing a flintlike rock |
| GEODE | Hollow, crystal-containing rock |
| SIENITE | Feldspar-containing rock: Var. |
